Mitsubishi L200. Manual — part 477

ON-VEHICLE SERVICE

POWER STEERING

37-11

FLUID REPLACEMENT

M1372002101284

Raise and support the front wheels.

AC701953 AC

Return hose

Return hose

Vinyl hose

Container

1. Disconnect the return hose connection, and then

connect a vinyl hose to the return hose, and drain
the fluid into a container.

AC701887

Crank angle
sensor connector

AB

2. Disconnect the crank angle sensor connector.

NOTE: Doing this will prevent carrying out fuel
injection.

3. While operating the starter motor intermittently,

turn the steering wheel all the way to the left and
right several times to drain all of the fluid.

4. Connect the return hose securely, and then

secure with the clip.

5. Fill the oil reservoir with specified fluid up to

between "MAX" and "MIN" marks, and then bleed
the air (Refer to

P.37-11

).

Specified fluid: ATF DEXRON III or DEXRON
II

POWER STEERING SYSTEM AIR
BLEEDING

M1372002201270

Perform air bleeding procedure as necessary after
replacing the steering gear or the steering fluid lines.

AC701887

Crank angle
sensor connector

AB

1. Disconnect the crank angle sensor connector.

NOTE: Doing this will prevent carrying out fuel
injection.

2. Raise and support the front wheels.

CAUTION

Perform air bleeding only while cranking the
engine. If air bleeding is performed while the
engine is running, air could enter the fluid. Dur-
ing air bleeding, refill the steering fluid supply so
that the level never falls below the "MIN" mark on
the oil reservoir.
3. Turn the steering wheel all the way to the left and

right five or six times while using the starter motor
to crank the engine intermittently several times
(for 15 to 20 seconds).

4. Connect the crank angle sensor connector, start

the engine, and let it idle.

5. Turn the steering wheel to the left and right until

there are no air bubbles in the oil reservoir.

6. Confirm that the fluid is not milky, and that the

level is between "MAX" and "MIN" marks.

7. Confirm that there is very little change in the fluid

level when the steering wheel is turned left and
right.

ON-VEHICLE SERVICE

POWER STEERING

37-12

CAUTION

If the fluid level rises suddenly after the engine is
stopped, the air has not been completely bled. If
air bleeding is not complete, there will be abnor-
mal noises from the pump and the flow-control
valve, and this condition could cause reduce the
life of the power steering components.

ACX01131

With engine running

With engine stopped

AC

Fluid level change: Within 5 mm

8. Confirm that the change in the fluid level is no

more than 5 mm when the engine is stopped and
when it is running.

9. If the change of the fluid level is 5 mm or more,

the air has not been completely bled from the
system. The air bleeding procedure must be
repeated.

10.Use M.U.T-III to check if the diagnosis code is set.

If the diagnosis code is set, erase it (Refer to
GROUP 00

− How to Use Troubleshooting/

Inspection Service Points

− Diagnosis Function ).

OIL PUMP PRESSURE TEST

M1372002300638

ACX01133 Ai

Temperature
gauge

Oil reservoir

Oil
pump

Oil pressure
gauge adapter B
(MB991549)

Shut-off valve

Power steering
oil pressure gauge
(MB990662)

Oil pressure
gauge
adapter A
(MB991548)

1. Disconnect the pressure hose from the oil pump,

and then connect following special tools.

• Power steering oil pressure gauge (MB990662)

• Oil pressure gauge adapter A (pump side)

(MB991548)

• Oil pressure gauge adapter B (hose side)

(MB991549)

2. Bleed air, then turn the steering wheel several

times while the vehicle is not moving so that the
temperature of the fluid rises to approximately 50
− 60°C.

3. Start the engine and allow it to idle.

CAUTION

The pressure gauge shut-off valve must not
remain closed for more than 10 seconds.
4. Fully close the shut-off valve of the pressure

gauge and measure the oil pump relief pressure
to confirm that it is within the standard value
range. Open it again immediately after checking
the pressure.

Standard value: 8.5

− 9.0 MPa

5. If it is not within the standard value, replace the oil

pump.

6. Check whether or not the hydraulic pressure is

the standard value when no-load conditions are
created by fully opening the shut-off valve of the
pressure gauge.

Standard value: 0.5 MPa

7. If it is not within the standard value, the probable

cause is a malfunction of the oil line or steering
gear, so check these parts and repair as
necessary.

8. Turn the steering wheel all the way to the left or

right; then check whether or not the retention
hydraulic pressure is the standard value.

Standard value: 8.5

− 9.0 MPa

9. If not the standard value, overhaul the steering

gear. Remeasure fluid pressure.

10. Remove the special tools, and then tighten the

pressure hose to the specified torque.

Tightening torque: 57

± 7 N⋅m

11. Bleed the system (Refer to

P.37-11

).

ON-VEHICLE SERVICE

POWER STEERING

37-13

POWER STEERING PRESSURE SWITCH
CHECK

M1372007200540

AC604168 AC

Shut-off
valve

Temperature
gauge

Oil
pump

Oil reservoir

Power steering
oil pressure gauge
(MB990662)

Oil pressure
gauge adapter A
(MB991548)

Oil pressure
gauge adapter B
(MB991549)

1. Disconnect the pressure hose from the oil pump,

and then connect following special tools.

• Power steering oil pressure gauge (MB990662)

• Oil pressure gauge adapter A (pump side)

(MB991548)

• Oil pressure gauge adapter B (hose side)

(MB991549)

2. Bleed air, and then turn the steering wheel several

times while the vehicle is not moving so that the
temperature of the fluid rises to approximately 50
− 60°C.

3. The engine should be idling.
4. Disconnect the connector for the oil pressure

switch, and place an ohmmeter at the switch.

CAUTION

The pressure gauge shut-off valve must not
remain closed for more than 10 seconds.
5. Gradually close the shut-off valve of the pressure

gauge and increase the hydraulic pressure, then
check whether or not the hydraulic pressure that
activates the switch is the standard value.

Standard value: 1.8

− 2.4 MPa

6. Gradually open the shut-off valve and reduce the

hydraulic pressure; then check whether or not the
hydraulic pressure that deactivates the switch is
the standard value.

Standard value: 0.8

− 2.4 MPa

7. Remove the special tools, and then tighten the

pressure hose to the specified torque.

Tightening torque: 57

± 7 N⋅m

8. Bleed the system (Refer to

P.37-11

).

STEERING COLUMN SHAFT ASSEMBLY
SHOCK ABSORBING MECHANISM
CHECK

M1372013500335

If a collision accident occurs or severe impact is
applied on the steering wheel, the collision energy
absorbing mechanism may have operated. Once the
mechanism has operated, it will be inoperative even
it has suffered no apparent damage. Determine if the
steering column shaft can be reused by the following
procedure. If the collision energy absorbing mecha-
nism has already operated, replace the steering col-
umn shaft assembly (Refer to

P.37-18

).

If any excessive radial free play on the steering
wheel is found with the tilt lever in the lock position,
always check the steering shaft assembly.

WARNING

•

If the vehicle continues to be driven after
the collision absorbing mechanism has
operated, the steering column shaft may
be damaged while it is in use.

•

If there is a slack in the one-way capsule,
do not attempt to repair it but replace the
steering column shaft assembly.

INSPECTION PROCEDURE

1. Remove the lower and upper column covers.

CAUTION

Do not release the tilt lever until the steering col-
umn has been installed to complete this inspec-
tion procedure. Confirm that the tilt position is
uppermost position.
2. Ensure that the tilt lever is in the lock position.

NOTE: If not, place the tilt lever in the lock posi-
tion.

3. Loosen the two upper steering column mounting

bolts by two turns.

AC209935

Steering
column
assembly

AC

One-way capsule

Steering
column
mounting
bolt

ON-VEHICLE SERVICE

POWER STEERING

37-14

4. Hold the one-way capsule as shown, and then try

to lock them. If there is a slack in either of the
capsules, replace the steering column shaft
assembly (Refer to

P.37-18

).

NOTE: Installing a new steering column shaft
assembly, place the tilt lever in the lock position.

CAUTION

• Be careful that nothing is pinched between

the one-way capsules and the body.

• Do not release the tilt lever until the steering

column has been installed to complete this
inspection procedure.

5. If no problem is found during the inspection,

tighten the steering column mounting bolts (Refer
to

P.37-18

).